Type: BCS.Sym3.Operator.Server.IServerTagService

Tag service

Methods

Subscribe(System.String,System.Object,System.Object)

Subscribe to a tag value update event and specify a function as the callback when an update occurs.

• Parameters:
  • tagName: The tag name, this must exist within the tag manager. The name is case sensitive.
  • theObject: An object that is associated with the subscription, this object will be passed to the callback function. If no object is required then ’null’ may be passed.
  • function: Reference to the callback function that will be invoked when an update occurs
• Returns:
  • The return value is a numeric identifier that is unique for this subscription; it may be saved for later use. It is required parameter of the function used to unsubscribe to updates.
• Example:

Server.Tags.Subscribe("Tag1", "my object", Tag1Callback)
            ...
            function Tag1Callback(tagName, id, value, quality, theObject)
            {
            	System.Windows.Forms.MessageBox.Show("Value Changed: " + tagName + " - " + id + " - " + value + " - " + quality + " - " + theObject)
            }

UnSubscribe(System.Int32)

Called to unsubscribe to tag value update event

• Parameters:
  • id: The return value from a previous call to ‘Subscribe’. The value uniquely identifies the subscription to the system